Good old Richardson...a pox on them! (General discussion, unrelated to
3-500Zs...)
-WB2WIK/6
-----Original Message-----
From: Mike Schatzberg [mailto:cherokeehillfarm@earthlink.net]
Sent: Tuesday, July 18, 2006 4:09 PM
To: R L Measures; k7rdx
Cc: Amps
Subject: Re: [Amps] Life and gain of 3-500Z
According to the Richardson Electronics Data Sheet for the Amperex 3-500Z,
with the heavy graphite anode with the zirconium coating, the amplification
factor for the tube is 130 average. Richardson acquired Philips Electronics
transmitting tubes in 1988 and continues to manufacture these tubes.
Now, Varian Eimac published their 3-500Z spec sheet for their tube on March
15, 1968. At that time the amplification factor was given as 160 average.
Later, after various changes, Varian issued revisions to this sheet in 1970,
1973, 1977, 1979, and in the revision dated August 5, 1980, stated the
amplification factor to be 130 average.
I can only suspicion that the Chinese tubes are close to the 1968 design
from Varian Eimac.
If you wish copies of the original sheets, please advise me. I could make
them available on my website.
73 and Happy DXing,
Mike
W2AJI
----- Original Message -----
From: "R L Measures" <r@somis.org>
To: "k7rdx" <k7rdx@charter.net>
Cc: "Amps" <amps@contesting.com>
Sent: Tuesday, July 18, 2006 12:37 PM
Subject: Re: [Amps] Life and gain of 3-500Z
>
> On Jul 18, 2006, at 7:09 AM, k7rdx wrote:
>
> > The tubes (3-500z`s) were from RF Parts. I replaced (Henry 3K repair
> > job)some low hr Eimacs that one had developed a grid to filament
> > short. Gain
> > was compared to a nos pair of Eimac`s.Higher zsac for a given Ep
> > and close
> > to 10% more output for a given value of drive.Jim..
>
> Amperex 3-500Zs have an avg. Mu of c. 190 compared to Eimac's 130. I
> measure about the same PEP output from either brand, but Amperexes
> require c. 10% less drive to get there.
>
> > ----- Original Message -----
> > From: "Tom W8JI" <w8ji@w8ji.com>
> > To: "k7rdx" <k7rdx@charter.net>; "Amps" <amps@contesting.com>
> > Sent: Tuesday, July 18, 2006 3:14 AM
> > Subject: Life and gain of 3-500Z
> >
> >
> ...
> R L MEASURES, AG6K. 805-386-3734
> r@somis.org
>
>
>
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